Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_rd.c |
| 3 | * |
| 4 | * This file contains the Storage Engine <-> Ramdisk transport |
| 5 | * specific functions. |
| 6 | * |
| 7 | * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. |
| 8 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. |
| 9 | * Copyright (c) 2007-2010 Rising Tide Systems |
| 10 | * Copyright (c) 2008-2010 Linux-iSCSI.org |
| 11 | * |
| 12 | * Nicholas A. Bellinger <nab@kernel.org> |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, write to the Free Software |
| 26 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | * |
| 28 | ******************************************************************************/ |
| 29 | |
| 30 | #include <linux/version.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/parser.h> |
| 33 | #include <linux/timer.h> |
| 34 | #include <linux/blkdev.h> |
| 35 | #include <linux/slab.h> |
| 36 | #include <linux/spinlock.h> |
| 37 | #include <linux/smp_lock.h> |
| 38 | #include <scsi/scsi.h> |
| 39 | #include <scsi/scsi_host.h> |
| 40 | |
| 41 | #include <target/target_core_base.h> |
| 42 | #include <target/target_core_device.h> |
| 43 | #include <target/target_core_transport.h> |
| 44 | #include <target/target_core_fabric_ops.h> |
| 45 | |
| 46 | #include "target_core_rd.h" |
| 47 | |
| 48 | static struct se_subsystem_api rd_dr_template; |
| 49 | static struct se_subsystem_api rd_mcp_template; |
| 50 | |
| 51 | /* #define DEBUG_RAMDISK_MCP */ |
| 52 | /* #define DEBUG_RAMDISK_DR */ |
| 53 | |
| 54 | /* rd_attach_hba(): (Part of se_subsystem_api_t template) |
| 55 | * |
| 56 | * |
| 57 | */ |
| 58 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) |
| 59 | { |
| 60 | struct rd_host *rd_host; |
| 61 | |
| 62 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); |
| 63 | if (!(rd_host)) { |
| 64 | printk(KERN_ERR "Unable to allocate memory for struct rd_host\n"); |
| 65 | return -ENOMEM; |
| 66 | } |
| 67 | |
| 68 | rd_host->rd_host_id = host_id; |
| 69 | |
| 70 | atomic_set(&hba->left_queue_depth, RD_HBA_QUEUE_DEPTH); |
| 71 | atomic_set(&hba->max_queue_depth, RD_HBA_QUEUE_DEPTH); |
| 72 | hba->hba_ptr = (void *) rd_host; |
| 73 | |
| 74 | printk(KERN_INFO "CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
| 75 | " Generic Target Core Stack %s\n", hba->hba_id, |
| 76 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); |
| 77 | printk(KERN_INFO "CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" |
| 78 | " Target Core TCQ Depth: %d MaxSectors: %u\n", hba->hba_id, |
| 79 | rd_host->rd_host_id, atomic_read(&hba->max_queue_depth), |
| 80 | RD_MAX_SECTORS); |
| 81 | |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | static void rd_detach_hba(struct se_hba *hba) |
| 86 | { |
| 87 | struct rd_host *rd_host = hba->hba_ptr; |
| 88 | |
| 89 | printk(KERN_INFO "CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
| 90 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
| 91 | |
| 92 | kfree(rd_host); |
| 93 | hba->hba_ptr = NULL; |
| 94 | } |
| 95 | |
| 96 | /* rd_release_device_space(): |
| 97 | * |
| 98 | * |
| 99 | */ |
| 100 | static void rd_release_device_space(struct rd_dev *rd_dev) |
| 101 | { |
| 102 | u32 i, j, page_count = 0, sg_per_table; |
| 103 | struct rd_dev_sg_table *sg_table; |
| 104 | struct page *pg; |
| 105 | struct scatterlist *sg; |
| 106 | |
| 107 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) |
| 108 | return; |
| 109 | |
| 110 | sg_table = rd_dev->sg_table_array; |
| 111 | |
| 112 | for (i = 0; i < rd_dev->sg_table_count; i++) { |
| 113 | sg = sg_table[i].sg_table; |
| 114 | sg_per_table = sg_table[i].rd_sg_count; |
| 115 | |
| 116 | for (j = 0; j < sg_per_table; j++) { |
| 117 | pg = sg_page(&sg[j]); |
| 118 | if ((pg)) { |
| 119 | __free_page(pg); |
| 120 | page_count++; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | kfree(sg); |
| 125 | } |
| 126 | |
| 127 | printk(KERN_INFO "CORE_RD[%u] - Released device space for Ramdisk" |
| 128 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
| 129 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, |
| 130 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); |
| 131 | |
| 132 | kfree(sg_table); |
| 133 | rd_dev->sg_table_array = NULL; |
| 134 | rd_dev->sg_table_count = 0; |
| 135 | } |
| 136 | |
| 137 | |
| 138 | /* rd_build_device_space(): |
| 139 | * |
| 140 | * |
| 141 | */ |
| 142 | static int rd_build_device_space(struct rd_dev *rd_dev) |
| 143 | { |
| 144 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; |
| 145 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 146 | sizeof(struct scatterlist)); |
| 147 | struct rd_dev_sg_table *sg_table; |
| 148 | struct page *pg; |
| 149 | struct scatterlist *sg; |
| 150 | |
| 151 | if (rd_dev->rd_page_count <= 0) { |
| 152 | printk(KERN_ERR "Illegal page count: %u for Ramdisk device\n", |
| 153 | rd_dev->rd_page_count); |
| 154 | return -1; |
| 155 | } |
| 156 | total_sg_needed = rd_dev->rd_page_count; |
| 157 | |
| 158 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; |
| 159 | |
| 160 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); |
| 161 | if (!(sg_table)) { |
| 162 | printk(KERN_ERR "Unable to allocate memory for Ramdisk" |
| 163 | " scatterlist tables\n"); |
| 164 | return -1; |
| 165 | } |
| 166 | |
| 167 | rd_dev->sg_table_array = sg_table; |
| 168 | rd_dev->sg_table_count = sg_tables; |
| 169 | |
| 170 | while (total_sg_needed) { |
| 171 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
| 172 | max_sg_per_table : total_sg_needed; |
| 173 | |
| 174 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), |
| 175 | GFP_KERNEL); |
| 176 | if (!(sg)) { |
| 177 | printk(KERN_ERR "Unable to allocate scatterlist array" |
| 178 | " for struct rd_dev\n"); |
| 179 | return -1; |
| 180 | } |
| 181 | |
| 182 | sg_init_table((struct scatterlist *)&sg[0], sg_per_table); |
| 183 | |
| 184 | sg_table[i].sg_table = sg; |
| 185 | sg_table[i].rd_sg_count = sg_per_table; |
| 186 | sg_table[i].page_start_offset = page_offset; |
| 187 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) |
| 188 | - 1; |
| 189 | |
| 190 | for (j = 0; j < sg_per_table; j++) { |
| 191 | pg = alloc_pages(GFP_KERNEL, 0); |
| 192 | if (!(pg)) { |
| 193 | printk(KERN_ERR "Unable to allocate scatterlist" |
| 194 | " pages for struct rd_dev_sg_table\n"); |
| 195 | return -1; |
| 196 | } |
| 197 | sg_assign_page(&sg[j], pg); |
| 198 | sg[j].length = PAGE_SIZE; |
| 199 | } |
| 200 | |
| 201 | page_offset += sg_per_table; |
| 202 | total_sg_needed -= sg_per_table; |
| 203 | } |
| 204 | |
| 205 | printk(KERN_INFO "CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
| 206 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
| 207 | rd_dev->rd_dev_id, rd_dev->rd_page_count, |
| 208 | rd_dev->sg_table_count); |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | static void *rd_allocate_virtdevice( |
| 214 | struct se_hba *hba, |
| 215 | const char *name, |
| 216 | int rd_direct) |
| 217 | { |
| 218 | struct rd_dev *rd_dev; |
| 219 | struct rd_host *rd_host = hba->hba_ptr; |
| 220 | |
| 221 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); |
| 222 | if (!(rd_dev)) { |
| 223 | printk(KERN_ERR "Unable to allocate memory for struct rd_dev\n"); |
| 224 | return NULL; |
| 225 | } |
| 226 | |
| 227 | rd_dev->rd_host = rd_host; |
| 228 | rd_dev->rd_direct = rd_direct; |
| 229 | |
| 230 | return rd_dev; |
| 231 | } |
| 232 | |
| 233 | static void *rd_DIRECT_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 234 | { |
| 235 | return rd_allocate_virtdevice(hba, name, 1); |
| 236 | } |
| 237 | |
| 238 | static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) |
| 239 | { |
| 240 | return rd_allocate_virtdevice(hba, name, 0); |
| 241 | } |
| 242 | |
| 243 | /* rd_create_virtdevice(): |
| 244 | * |
| 245 | * |
| 246 | */ |
| 247 | static struct se_device *rd_create_virtdevice( |
| 248 | struct se_hba *hba, |
| 249 | struct se_subsystem_dev *se_dev, |
| 250 | void *p, |
| 251 | int rd_direct) |
| 252 | { |
| 253 | struct se_device *dev; |
| 254 | struct se_dev_limits dev_limits; |
| 255 | struct rd_dev *rd_dev = p; |
| 256 | struct rd_host *rd_host = hba->hba_ptr; |
| 257 | int dev_flags = 0; |
| 258 | char prod[16], rev[4]; |
| 259 | |
| 260 | memset(&dev_limits, 0, sizeof(struct se_dev_limits)); |
| 261 | |
| 262 | if (rd_build_device_space(rd_dev) < 0) |
| 263 | goto fail; |
| 264 | |
| 265 | snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); |
| 266 | snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : |
| 267 | RD_MCP_VERSION); |
| 268 | |
| 269 | dev_limits.limits.logical_block_size = RD_BLOCKSIZE; |
| 270 | dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; |
| 271 | dev_limits.limits.max_sectors = RD_MAX_SECTORS; |
| 272 | dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; |
| 273 | dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; |
| 274 | |
| 275 | dev = transport_add_device_to_core_hba(hba, |
| 276 | (rd_dev->rd_direct) ? &rd_dr_template : |
| 277 | &rd_mcp_template, se_dev, dev_flags, (void *)rd_dev, |
| 278 | &dev_limits, prod, rev); |
| 279 | if (!(dev)) |
| 280 | goto fail; |
| 281 | |
| 282 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; |
| 283 | rd_dev->rd_queue_depth = dev->queue_depth; |
| 284 | |
| 285 | printk(KERN_INFO "CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" |
| 286 | " %u pages in %u tables, %lu total bytes\n", |
| 287 | rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : |
| 288 | "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, |
| 289 | rd_dev->sg_table_count, |
| 290 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); |
| 291 | |
| 292 | return dev; |
| 293 | |
| 294 | fail: |
| 295 | rd_release_device_space(rd_dev); |
| 296 | return NULL; |
| 297 | } |
| 298 | |
| 299 | static struct se_device *rd_DIRECT_create_virtdevice( |
| 300 | struct se_hba *hba, |
| 301 | struct se_subsystem_dev *se_dev, |
| 302 | void *p) |
| 303 | { |
| 304 | return rd_create_virtdevice(hba, se_dev, p, 1); |
| 305 | } |
| 306 | |
| 307 | static struct se_device *rd_MEMCPY_create_virtdevice( |
| 308 | struct se_hba *hba, |
| 309 | struct se_subsystem_dev *se_dev, |
| 310 | void *p) |
| 311 | { |
| 312 | return rd_create_virtdevice(hba, se_dev, p, 0); |
| 313 | } |
| 314 | |
| 315 | /* rd_free_device(): (Part of se_subsystem_api_t template) |
| 316 | * |
| 317 | * |
| 318 | */ |
| 319 | static void rd_free_device(void *p) |
| 320 | { |
| 321 | struct rd_dev *rd_dev = p; |
| 322 | |
| 323 | rd_release_device_space(rd_dev); |
| 324 | kfree(rd_dev); |
| 325 | } |
| 326 | |
| 327 | static inline struct rd_request *RD_REQ(struct se_task *task) |
| 328 | { |
| 329 | return container_of(task, struct rd_request, rd_task); |
| 330 | } |
| 331 | |
| 332 | static struct se_task * |
| 333 | rd_alloc_task(struct se_cmd *cmd) |
| 334 | { |
| 335 | struct rd_request *rd_req; |
| 336 | |
| 337 | rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); |
| 338 | if (!rd_req) { |
| 339 | printk(KERN_ERR "Unable to allocate struct rd_request\n"); |
| 340 | return NULL; |
| 341 | } |
| 342 | rd_req->rd_dev = SE_DEV(cmd)->dev_ptr; |
| 343 | |
| 344 | return &rd_req->rd_task; |
| 345 | } |
| 346 | |
| 347 | /* rd_get_sg_table(): |
| 348 | * |
| 349 | * |
| 350 | */ |
| 351 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
| 352 | { |
| 353 | u32 i; |
| 354 | struct rd_dev_sg_table *sg_table; |
| 355 | |
| 356 | for (i = 0; i < rd_dev->sg_table_count; i++) { |
| 357 | sg_table = &rd_dev->sg_table_array[i]; |
| 358 | if ((sg_table->page_start_offset <= page) && |
| 359 | (sg_table->page_end_offset >= page)) |
| 360 | return sg_table; |
| 361 | } |
| 362 | |
| 363 | printk(KERN_ERR "Unable to locate struct rd_dev_sg_table for page: %u\n", |
| 364 | page); |
| 365 | |
| 366 | return NULL; |
| 367 | } |
| 368 | |
| 369 | /* rd_MEMCPY_read(): |
| 370 | * |
| 371 | * |
| 372 | */ |
| 373 | static int rd_MEMCPY_read(struct rd_request *req) |
| 374 | { |
| 375 | struct se_task *task = &req->rd_task; |
| 376 | struct rd_dev *dev = req->rd_dev; |
| 377 | struct rd_dev_sg_table *table; |
| 378 | struct scatterlist *sg_d, *sg_s; |
| 379 | void *dst, *src; |
| 380 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; |
| 381 | u32 length, page_end = 0, table_sg_end; |
| 382 | u32 rd_offset = req->rd_offset; |
| 383 | |
| 384 | table = rd_get_sg_table(dev, req->rd_page); |
| 385 | if (!(table)) |
| 386 | return -1; |
| 387 | |
| 388 | table_sg_end = (table->page_end_offset - req->rd_page); |
| 389 | sg_d = task->task_sg; |
| 390 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; |
| 391 | #ifdef DEBUG_RAMDISK_MCP |
| 392 | printk(KERN_INFO "RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" |
| 393 | " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
| 394 | req->rd_page, req->rd_offset); |
| 395 | #endif |
| 396 | src_offset = rd_offset; |
| 397 | |
| 398 | while (req->rd_size) { |
| 399 | if ((sg_d[i].length - dst_offset) < |
| 400 | (sg_s[j].length - src_offset)) { |
| 401 | length = (sg_d[i].length - dst_offset); |
| 402 | #ifdef DEBUG_RAMDISK_MCP |
| 403 | printk(KERN_INFO "Step 1 - sg_d[%d]: %p length: %d" |
| 404 | " offset: %u sg_s[%d].length: %u\n", i, |
| 405 | &sg_d[i], sg_d[i].length, sg_d[i].offset, j, |
| 406 | sg_s[j].length); |
| 407 | printk(KERN_INFO "Step 1 - length: %u dst_offset: %u" |
| 408 | " src_offset: %u\n", length, dst_offset, |
| 409 | src_offset); |
| 410 | #endif |
| 411 | if (length > req->rd_size) |
| 412 | length = req->rd_size; |
| 413 | |
| 414 | dst = sg_virt(&sg_d[i++]) + dst_offset; |
| 415 | if (!dst) |
| 416 | BUG(); |
| 417 | |
| 418 | src = sg_virt(&sg_s[j]) + src_offset; |
| 419 | if (!src) |
| 420 | BUG(); |
| 421 | |
| 422 | dst_offset = 0; |
| 423 | src_offset = length; |
| 424 | page_end = 0; |
| 425 | } else { |
| 426 | length = (sg_s[j].length - src_offset); |
| 427 | #ifdef DEBUG_RAMDISK_MCP |
| 428 | printk(KERN_INFO "Step 2 - sg_d[%d]: %p length: %d" |
| 429 | " offset: %u sg_s[%d].length: %u\n", i, |
| 430 | &sg_d[i], sg_d[i].length, sg_d[i].offset, |
| 431 | j, sg_s[j].length); |
| 432 | printk(KERN_INFO "Step 2 - length: %u dst_offset: %u" |
| 433 | " src_offset: %u\n", length, dst_offset, |
| 434 | src_offset); |
| 435 | #endif |
| 436 | if (length > req->rd_size) |
| 437 | length = req->rd_size; |
| 438 | |
| 439 | dst = sg_virt(&sg_d[i]) + dst_offset; |
| 440 | if (!dst) |
| 441 | BUG(); |
| 442 | |
| 443 | if (sg_d[i].length == length) { |
| 444 | i++; |
| 445 | dst_offset = 0; |
| 446 | } else |
| 447 | dst_offset = length; |
| 448 | |
| 449 | src = sg_virt(&sg_s[j++]) + src_offset; |
| 450 | if (!src) |
| 451 | BUG(); |
| 452 | |
| 453 | src_offset = 0; |
| 454 | page_end = 1; |
| 455 | } |
| 456 | |
| 457 | memcpy(dst, src, length); |
| 458 | |
| 459 | #ifdef DEBUG_RAMDISK_MCP |
| 460 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," |
| 461 | " i: %u, j: %u\n", req->rd_page, |
| 462 | (req->rd_size - length), length, i, j); |
| 463 | #endif |
| 464 | req->rd_size -= length; |
| 465 | if (!(req->rd_size)) |
| 466 | return 0; |
| 467 | |
| 468 | if (!page_end) |
| 469 | continue; |
| 470 | |
| 471 | if (++req->rd_page <= table->page_end_offset) { |
| 472 | #ifdef DEBUG_RAMDISK_MCP |
| 473 | printk(KERN_INFO "page: %u in same page table\n", |
| 474 | req->rd_page); |
| 475 | #endif |
| 476 | continue; |
| 477 | } |
| 478 | #ifdef DEBUG_RAMDISK_MCP |
| 479 | printk(KERN_INFO "getting new page table for page: %u\n", |
| 480 | req->rd_page); |
| 481 | #endif |
| 482 | table = rd_get_sg_table(dev, req->rd_page); |
| 483 | if (!(table)) |
| 484 | return -1; |
| 485 | |
| 486 | sg_s = &table->sg_table[j = 0]; |
| 487 | } |
| 488 | |
| 489 | return 0; |
| 490 | } |
| 491 | |
| 492 | /* rd_MEMCPY_write(): |
| 493 | * |
| 494 | * |
| 495 | */ |
| 496 | static int rd_MEMCPY_write(struct rd_request *req) |
| 497 | { |
| 498 | struct se_task *task = &req->rd_task; |
| 499 | struct rd_dev *dev = req->rd_dev; |
| 500 | struct rd_dev_sg_table *table; |
| 501 | struct scatterlist *sg_d, *sg_s; |
| 502 | void *dst, *src; |
| 503 | u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; |
| 504 | u32 length, page_end = 0, table_sg_end; |
| 505 | u32 rd_offset = req->rd_offset; |
| 506 | |
| 507 | table = rd_get_sg_table(dev, req->rd_page); |
| 508 | if (!(table)) |
| 509 | return -1; |
| 510 | |
| 511 | table_sg_end = (table->page_end_offset - req->rd_page); |
| 512 | sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; |
| 513 | sg_s = task->task_sg; |
| 514 | #ifdef DEBUG_RAMDISK_MCP |
| 515 | printk(KERN_INFO "RD[%d] Write LBA: %llu, Size: %u, Page: %u," |
| 516 | " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, |
| 517 | req->rd_page, req->rd_offset); |
| 518 | #endif |
| 519 | dst_offset = rd_offset; |
| 520 | |
| 521 | while (req->rd_size) { |
| 522 | if ((sg_s[i].length - src_offset) < |
| 523 | (sg_d[j].length - dst_offset)) { |
| 524 | length = (sg_s[i].length - src_offset); |
| 525 | #ifdef DEBUG_RAMDISK_MCP |
| 526 | printk(KERN_INFO "Step 1 - sg_s[%d]: %p length: %d" |
| 527 | " offset: %d sg_d[%d].length: %u\n", i, |
| 528 | &sg_s[i], sg_s[i].length, sg_s[i].offset, |
| 529 | j, sg_d[j].length); |
| 530 | printk(KERN_INFO "Step 1 - length: %u src_offset: %u" |
| 531 | " dst_offset: %u\n", length, src_offset, |
| 532 | dst_offset); |
| 533 | #endif |
| 534 | if (length > req->rd_size) |
| 535 | length = req->rd_size; |
| 536 | |
| 537 | src = sg_virt(&sg_s[i++]) + src_offset; |
| 538 | if (!src) |
| 539 | BUG(); |
| 540 | |
| 541 | dst = sg_virt(&sg_d[j]) + dst_offset; |
| 542 | if (!dst) |
| 543 | BUG(); |
| 544 | |
| 545 | src_offset = 0; |
| 546 | dst_offset = length; |
| 547 | page_end = 0; |
| 548 | } else { |
| 549 | length = (sg_d[j].length - dst_offset); |
| 550 | #ifdef DEBUG_RAMDISK_MCP |
| 551 | printk(KERN_INFO "Step 2 - sg_s[%d]: %p length: %d" |
| 552 | " offset: %d sg_d[%d].length: %u\n", i, |
| 553 | &sg_s[i], sg_s[i].length, sg_s[i].offset, |
| 554 | j, sg_d[j].length); |
| 555 | printk(KERN_INFO "Step 2 - length: %u src_offset: %u" |
| 556 | " dst_offset: %u\n", length, src_offset, |
| 557 | dst_offset); |
| 558 | #endif |
| 559 | if (length > req->rd_size) |
| 560 | length = req->rd_size; |
| 561 | |
| 562 | src = sg_virt(&sg_s[i]) + src_offset; |
| 563 | if (!src) |
| 564 | BUG(); |
| 565 | |
| 566 | if (sg_s[i].length == length) { |
| 567 | i++; |
| 568 | src_offset = 0; |
| 569 | } else |
| 570 | src_offset = length; |
| 571 | |
| 572 | dst = sg_virt(&sg_d[j++]) + dst_offset; |
| 573 | if (!dst) |
| 574 | BUG(); |
| 575 | |
| 576 | dst_offset = 0; |
| 577 | page_end = 1; |
| 578 | } |
| 579 | |
| 580 | memcpy(dst, src, length); |
| 581 | |
| 582 | #ifdef DEBUG_RAMDISK_MCP |
| 583 | printk(KERN_INFO "page: %u, remaining size: %u, length: %u," |
| 584 | " i: %u, j: %u\n", req->rd_page, |
| 585 | (req->rd_size - length), length, i, j); |
| 586 | #endif |
| 587 | req->rd_size -= length; |
| 588 | if (!(req->rd_size)) |
| 589 | return 0; |
| 590 | |
| 591 | if (!page_end) |
| 592 | continue; |
| 593 | |
| 594 | if (++req->rd_page <= table->page_end_offset) { |
| 595 | #ifdef DEBUG_RAMDISK_MCP |
| 596 | printk(KERN_INFO "page: %u in same page table\n", |
| 597 | req->rd_page); |
| 598 | #endif |
| 599 | continue; |
| 600 | } |
| 601 | #ifdef DEBUG_RAMDISK_MCP |
| 602 | printk(KERN_INFO "getting new page table for page: %u\n", |
| 603 | req->rd_page); |
| 604 | #endif |
| 605 | table = rd_get_sg_table(dev, req->rd_page); |
| 606 | if (!(table)) |
| 607 | return -1; |
| 608 | |
| 609 | sg_d = &table->sg_table[j = 0]; |
| 610 | } |
| 611 | |
| 612 | return 0; |
| 613 | } |
| 614 | |
| 615 | /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) |
| 616 | * |
| 617 | * |
| 618 | */ |
| 619 | static int rd_MEMCPY_do_task(struct se_task *task) |
| 620 | { |
| 621 | struct se_device *dev = task->se_dev; |
| 622 | struct rd_request *req = RD_REQ(task); |
| 623 | unsigned long long lba; |
| 624 | int ret; |
| 625 | |
| 626 | req->rd_page = (task->task_lba * DEV_ATTRIB(dev)->block_size) / PAGE_SIZE; |
| 627 | lba = task->task_lba; |
| 628 | req->rd_offset = (do_div(lba, |
| 629 | (PAGE_SIZE / DEV_ATTRIB(dev)->block_size))) * |
| 630 | DEV_ATTRIB(dev)->block_size; |
| 631 | req->rd_size = task->task_size; |
| 632 | |
| 633 | if (task->task_data_direction == DMA_FROM_DEVICE) |
| 634 | ret = rd_MEMCPY_read(req); |
| 635 | else |
| 636 | ret = rd_MEMCPY_write(req); |
| 637 | |
| 638 | if (ret != 0) |
| 639 | return ret; |
| 640 | |
| 641 | task->task_scsi_status = GOOD; |
| 642 | transport_complete_task(task, 1); |
| 643 | |
| 644 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 645 | } |
| 646 | |
| 647 | /* rd_DIRECT_with_offset(): |
| 648 | * |
| 649 | * |
| 650 | */ |
| 651 | static int rd_DIRECT_with_offset( |
| 652 | struct se_task *task, |
| 653 | struct list_head *se_mem_list, |
| 654 | u32 *se_mem_cnt, |
| 655 | u32 *task_offset) |
| 656 | { |
| 657 | struct rd_request *req = RD_REQ(task); |
| 658 | struct rd_dev *dev = req->rd_dev; |
| 659 | struct rd_dev_sg_table *table; |
| 660 | struct se_mem *se_mem; |
| 661 | struct scatterlist *sg_s; |
| 662 | u32 j = 0, set_offset = 1; |
| 663 | u32 get_next_table = 0, offset_length, table_sg_end; |
| 664 | |
| 665 | table = rd_get_sg_table(dev, req->rd_page); |
| 666 | if (!(table)) |
| 667 | return -1; |
| 668 | |
| 669 | table_sg_end = (table->page_end_offset - req->rd_page); |
| 670 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; |
| 671 | #ifdef DEBUG_RAMDISK_DR |
| 672 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
| 673 | (task->task_data_direction == DMA_TO_DEVICE) ? |
| 674 | "Write" : "Read", |
| 675 | task->task_lba, req->rd_size, req->rd_page, req->rd_offset); |
| 676 | #endif |
| 677 | while (req->rd_size) { |
| 678 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); |
| 679 | if (!(se_mem)) { |
| 680 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); |
| 681 | return -1; |
| 682 | } |
| 683 | INIT_LIST_HEAD(&se_mem->se_list); |
| 684 | |
| 685 | if (set_offset) { |
| 686 | offset_length = sg_s[j].length - req->rd_offset; |
| 687 | if (offset_length > req->rd_size) |
| 688 | offset_length = req->rd_size; |
| 689 | |
| 690 | se_mem->se_page = sg_page(&sg_s[j++]); |
| 691 | se_mem->se_off = req->rd_offset; |
| 692 | se_mem->se_len = offset_length; |
| 693 | |
| 694 | set_offset = 0; |
| 695 | get_next_table = (j > table_sg_end); |
| 696 | goto check_eot; |
| 697 | } |
| 698 | |
| 699 | offset_length = (req->rd_size < req->rd_offset) ? |
| 700 | req->rd_size : req->rd_offset; |
| 701 | |
| 702 | se_mem->se_page = sg_page(&sg_s[j]); |
| 703 | se_mem->se_len = offset_length; |
| 704 | |
| 705 | set_offset = 1; |
| 706 | |
| 707 | check_eot: |
| 708 | #ifdef DEBUG_RAMDISK_DR |
| 709 | printk(KERN_INFO "page: %u, size: %u, offset_length: %u, j: %u" |
| 710 | " se_mem: %p, se_page: %p se_off: %u se_len: %u\n", |
| 711 | req->rd_page, req->rd_size, offset_length, j, se_mem, |
| 712 | se_mem->se_page, se_mem->se_off, se_mem->se_len); |
| 713 | #endif |
| 714 | list_add_tail(&se_mem->se_list, se_mem_list); |
| 715 | (*se_mem_cnt)++; |
| 716 | |
| 717 | req->rd_size -= offset_length; |
| 718 | if (!(req->rd_size)) |
| 719 | goto out; |
| 720 | |
| 721 | if (!set_offset && !get_next_table) |
| 722 | continue; |
| 723 | |
| 724 | if (++req->rd_page <= table->page_end_offset) { |
| 725 | #ifdef DEBUG_RAMDISK_DR |
| 726 | printk(KERN_INFO "page: %u in same page table\n", |
| 727 | req->rd_page); |
| 728 | #endif |
| 729 | continue; |
| 730 | } |
| 731 | #ifdef DEBUG_RAMDISK_DR |
| 732 | printk(KERN_INFO "getting new page table for page: %u\n", |
| 733 | req->rd_page); |
| 734 | #endif |
| 735 | table = rd_get_sg_table(dev, req->rd_page); |
| 736 | if (!(table)) |
| 737 | return -1; |
| 738 | |
| 739 | sg_s = &table->sg_table[j = 0]; |
| 740 | } |
| 741 | |
| 742 | out: |
| 743 | T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; |
| 744 | #ifdef DEBUG_RAMDISK_DR |
| 745 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", |
| 746 | *se_mem_cnt); |
| 747 | #endif |
| 748 | return 0; |
| 749 | } |
| 750 | |
| 751 | /* rd_DIRECT_without_offset(): |
| 752 | * |
| 753 | * |
| 754 | */ |
| 755 | static int rd_DIRECT_without_offset( |
| 756 | struct se_task *task, |
| 757 | struct list_head *se_mem_list, |
| 758 | u32 *se_mem_cnt, |
| 759 | u32 *task_offset) |
| 760 | { |
| 761 | struct rd_request *req = RD_REQ(task); |
| 762 | struct rd_dev *dev = req->rd_dev; |
| 763 | struct rd_dev_sg_table *table; |
| 764 | struct se_mem *se_mem; |
| 765 | struct scatterlist *sg_s; |
| 766 | u32 length, j = 0; |
| 767 | |
| 768 | table = rd_get_sg_table(dev, req->rd_page); |
| 769 | if (!(table)) |
| 770 | return -1; |
| 771 | |
| 772 | sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; |
| 773 | #ifdef DEBUG_RAMDISK_DR |
| 774 | printk(KERN_INFO "%s DIRECT LBA: %llu, Size: %u, Page: %u\n", |
| 775 | (task->task_data_direction == DMA_TO_DEVICE) ? |
| 776 | "Write" : "Read", |
| 777 | task->task_lba, req->rd_size, req->rd_page); |
| 778 | #endif |
| 779 | while (req->rd_size) { |
| 780 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); |
| 781 | if (!(se_mem)) { |
| 782 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); |
| 783 | return -1; |
| 784 | } |
| 785 | INIT_LIST_HEAD(&se_mem->se_list); |
| 786 | |
| 787 | length = (req->rd_size < sg_s[j].length) ? |
| 788 | req->rd_size : sg_s[j].length; |
| 789 | |
| 790 | se_mem->se_page = sg_page(&sg_s[j++]); |
| 791 | se_mem->se_len = length; |
| 792 | |
| 793 | #ifdef DEBUG_RAMDISK_DR |
| 794 | printk(KERN_INFO "page: %u, size: %u, j: %u se_mem: %p," |
| 795 | " se_page: %p se_off: %u se_len: %u\n", req->rd_page, |
| 796 | req->rd_size, j, se_mem, se_mem->se_page, |
| 797 | se_mem->se_off, se_mem->se_len); |
| 798 | #endif |
| 799 | list_add_tail(&se_mem->se_list, se_mem_list); |
| 800 | (*se_mem_cnt)++; |
| 801 | |
| 802 | req->rd_size -= length; |
| 803 | if (!(req->rd_size)) |
| 804 | goto out; |
| 805 | |
| 806 | if (++req->rd_page <= table->page_end_offset) { |
| 807 | #ifdef DEBUG_RAMDISK_DR |
| 808 | printk("page: %u in same page table\n", |
| 809 | req->rd_page); |
| 810 | #endif |
| 811 | continue; |
| 812 | } |
| 813 | #ifdef DEBUG_RAMDISK_DR |
| 814 | printk(KERN_INFO "getting new page table for page: %u\n", |
| 815 | req->rd_page); |
| 816 | #endif |
| 817 | table = rd_get_sg_table(dev, req->rd_page); |
| 818 | if (!(table)) |
| 819 | return -1; |
| 820 | |
| 821 | sg_s = &table->sg_table[j = 0]; |
| 822 | } |
| 823 | |
| 824 | out: |
| 825 | T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; |
| 826 | #ifdef DEBUG_RAMDISK_DR |
| 827 | printk(KERN_INFO "RD_DR - Allocated %u struct se_mem segments for task\n", |
| 828 | *se_mem_cnt); |
| 829 | #endif |
| 830 | return 0; |
| 831 | } |
| 832 | |
| 833 | /* rd_DIRECT_do_se_mem_map(): |
| 834 | * |
| 835 | * |
| 836 | */ |
| 837 | static int rd_DIRECT_do_se_mem_map( |
| 838 | struct se_task *task, |
| 839 | struct list_head *se_mem_list, |
| 840 | void *in_mem, |
| 841 | struct se_mem *in_se_mem, |
| 842 | struct se_mem **out_se_mem, |
| 843 | u32 *se_mem_cnt, |
| 844 | u32 *task_offset_in) |
| 845 | { |
| 846 | struct se_cmd *cmd = task->task_se_cmd; |
| 847 | struct rd_request *req = RD_REQ(task); |
| 848 | u32 task_offset = *task_offset_in; |
| 849 | unsigned long long lba; |
| 850 | int ret; |
| 851 | |
| 852 | req->rd_page = ((task->task_lba * DEV_ATTRIB(task->se_dev)->block_size) / |
| 853 | PAGE_SIZE); |
| 854 | lba = task->task_lba; |
| 855 | req->rd_offset = (do_div(lba, |
| 856 | (PAGE_SIZE / DEV_ATTRIB(task->se_dev)->block_size))) * |
| 857 | DEV_ATTRIB(task->se_dev)->block_size; |
| 858 | req->rd_size = task->task_size; |
| 859 | |
| 860 | if (req->rd_offset) |
| 861 | ret = rd_DIRECT_with_offset(task, se_mem_list, se_mem_cnt, |
| 862 | task_offset_in); |
| 863 | else |
| 864 | ret = rd_DIRECT_without_offset(task, se_mem_list, se_mem_cnt, |
| 865 | task_offset_in); |
| 866 | |
| 867 | if (ret < 0) |
| 868 | return ret; |
| 869 | |
| 870 | if (CMD_TFO(cmd)->task_sg_chaining == 0) |
| 871 | return 0; |
| 872 | /* |
| 873 | * Currently prevent writers from multiple HW fabrics doing |
| 874 | * pci_map_sg() to RD_DR's internal scatterlist memory. |
| 875 | */ |
| 876 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 877 | printk(KERN_ERR "DMA_TO_DEVICE not supported for" |
| 878 | " RAMDISK_DR with task_sg_chaining=1\n"); |
| 879 | return -1; |
| 880 | } |
| 881 | /* |
| 882 | * Special case for if task_sg_chaining is enabled, then |
| 883 | * we setup struct se_task->task_sg[], as it will be used by |
| 884 | * transport_do_task_sg_chain() for creating chainged SGLs |
| 885 | * across multiple struct se_task->task_sg[]. |
| 886 | */ |
| 887 | if (!(transport_calc_sg_num(task, |
| 888 | list_entry(T_TASK(cmd)->t_mem_list->next, |
| 889 | struct se_mem, se_list), |
| 890 | task_offset))) |
| 891 | return -1; |
| 892 | |
| 893 | return transport_map_mem_to_sg(task, se_mem_list, task->task_sg, |
| 894 | list_entry(T_TASK(cmd)->t_mem_list->next, |
| 895 | struct se_mem, se_list), |
| 896 | out_se_mem, se_mem_cnt, task_offset_in); |
| 897 | } |
| 898 | |
| 899 | /* rd_DIRECT_do_task(): (Part of se_subsystem_api_t template) |
| 900 | * |
| 901 | * |
| 902 | */ |
| 903 | static int rd_DIRECT_do_task(struct se_task *task) |
| 904 | { |
| 905 | /* |
| 906 | * At this point the locally allocated RD tables have been mapped |
| 907 | * to struct se_mem elements in rd_DIRECT_do_se_mem_map(). |
| 908 | */ |
| 909 | task->task_scsi_status = GOOD; |
| 910 | transport_complete_task(task, 1); |
| 911 | |
| 912 | return PYX_TRANSPORT_SENT_TO_TRANSPORT; |
| 913 | } |
| 914 | |
| 915 | /* rd_free_task(): (Part of se_subsystem_api_t template) |
| 916 | * |
| 917 | * |
| 918 | */ |
| 919 | static void rd_free_task(struct se_task *task) |
| 920 | { |
| 921 | kfree(RD_REQ(task)); |
| 922 | } |
| 923 | |
| 924 | enum { |
| 925 | Opt_rd_pages, Opt_err |
| 926 | }; |
| 927 | |
| 928 | static match_table_t tokens = { |
| 929 | {Opt_rd_pages, "rd_pages=%d"}, |
| 930 | {Opt_err, NULL} |
| 931 | }; |
| 932 | |
| 933 | static ssize_t rd_set_configfs_dev_params( |
| 934 | struct se_hba *hba, |
| 935 | struct se_subsystem_dev *se_dev, |
| 936 | const char *page, |
| 937 | ssize_t count) |
| 938 | { |
| 939 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; |
| 940 | char *orig, *ptr, *opts; |
| 941 | substring_t args[MAX_OPT_ARGS]; |
| 942 | int ret = 0, arg, token; |
| 943 | |
| 944 | opts = kstrdup(page, GFP_KERNEL); |
| 945 | if (!opts) |
| 946 | return -ENOMEM; |
| 947 | |
| 948 | orig = opts; |
| 949 | |
| 950 | while ((ptr = strsep(&opts, ",")) != NULL) { |
| 951 | if (!*ptr) |
| 952 | continue; |
| 953 | |
| 954 | token = match_token(ptr, tokens, args); |
| 955 | switch (token) { |
| 956 | case Opt_rd_pages: |
| 957 | match_int(args, &arg); |
| 958 | rd_dev->rd_page_count = arg; |
| 959 | printk(KERN_INFO "RAMDISK: Referencing Page" |
| 960 | " Count: %u\n", rd_dev->rd_page_count); |
| 961 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; |
| 962 | break; |
| 963 | default: |
| 964 | break; |
| 965 | } |
| 966 | } |
| 967 | |
| 968 | kfree(orig); |
| 969 | return (!ret) ? count : ret; |
| 970 | } |
| 971 | |
| 972 | static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) |
| 973 | { |
| 974 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; |
| 975 | |
| 976 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
| 977 | printk(KERN_INFO "Missing rd_pages= parameter\n"); |
| 978 | return -1; |
| 979 | } |
| 980 | |
| 981 | return 0; |
| 982 | } |
| 983 | |
| 984 | static ssize_t rd_show_configfs_dev_params( |
| 985 | struct se_hba *hba, |
| 986 | struct se_subsystem_dev *se_dev, |
| 987 | char *b) |
| 988 | { |
| 989 | struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; |
| 990 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", |
| 991 | rd_dev->rd_dev_id, (rd_dev->rd_direct) ? |
| 992 | "rd_direct" : "rd_mcp"); |
| 993 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
| 994 | " SG_table_count: %u\n", rd_dev->rd_page_count, |
| 995 | PAGE_SIZE, rd_dev->sg_table_count); |
| 996 | return bl; |
| 997 | } |
| 998 | |
| 999 | /* rd_get_cdb(): (Part of se_subsystem_api_t template) |
| 1000 | * |
| 1001 | * |
| 1002 | */ |
| 1003 | static unsigned char *rd_get_cdb(struct se_task *task) |
| 1004 | { |
| 1005 | struct rd_request *req = RD_REQ(task); |
| 1006 | |
| 1007 | return req->rd_scsi_cdb; |
| 1008 | } |
| 1009 | |
| 1010 | static u32 rd_get_device_rev(struct se_device *dev) |
| 1011 | { |
| 1012 | return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ |
| 1013 | } |
| 1014 | |
| 1015 | static u32 rd_get_device_type(struct se_device *dev) |
| 1016 | { |
| 1017 | return TYPE_DISK; |
| 1018 | } |
| 1019 | |
| 1020 | static sector_t rd_get_blocks(struct se_device *dev) |
| 1021 | { |
| 1022 | struct rd_dev *rd_dev = dev->dev_ptr; |
| 1023 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
| 1024 | DEV_ATTRIB(dev)->block_size) - 1; |
| 1025 | |
| 1026 | return blocks_long; |
| 1027 | } |
| 1028 | |
| 1029 | static struct se_subsystem_api rd_dr_template = { |
| 1030 | .name = "rd_dr", |
| 1031 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, |
| 1032 | .attach_hba = rd_attach_hba, |
| 1033 | .detach_hba = rd_detach_hba, |
| 1034 | .allocate_virtdevice = rd_DIRECT_allocate_virtdevice, |
| 1035 | .create_virtdevice = rd_DIRECT_create_virtdevice, |
| 1036 | .free_device = rd_free_device, |
| 1037 | .alloc_task = rd_alloc_task, |
| 1038 | .do_task = rd_DIRECT_do_task, |
| 1039 | .free_task = rd_free_task, |
| 1040 | .check_configfs_dev_params = rd_check_configfs_dev_params, |
| 1041 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
| 1042 | .show_configfs_dev_params = rd_show_configfs_dev_params, |
| 1043 | .get_cdb = rd_get_cdb, |
| 1044 | .get_device_rev = rd_get_device_rev, |
| 1045 | .get_device_type = rd_get_device_type, |
| 1046 | .get_blocks = rd_get_blocks, |
| 1047 | .do_se_mem_map = rd_DIRECT_do_se_mem_map, |
| 1048 | }; |
| 1049 | |
| 1050 | static struct se_subsystem_api rd_mcp_template = { |
| 1051 | .name = "rd_mcp", |
| 1052 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, |
| 1053 | .attach_hba = rd_attach_hba, |
| 1054 | .detach_hba = rd_detach_hba, |
| 1055 | .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, |
| 1056 | .create_virtdevice = rd_MEMCPY_create_virtdevice, |
| 1057 | .free_device = rd_free_device, |
| 1058 | .alloc_task = rd_alloc_task, |
| 1059 | .do_task = rd_MEMCPY_do_task, |
| 1060 | .free_task = rd_free_task, |
| 1061 | .check_configfs_dev_params = rd_check_configfs_dev_params, |
| 1062 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
| 1063 | .show_configfs_dev_params = rd_show_configfs_dev_params, |
| 1064 | .get_cdb = rd_get_cdb, |
| 1065 | .get_device_rev = rd_get_device_rev, |
| 1066 | .get_device_type = rd_get_device_type, |
| 1067 | .get_blocks = rd_get_blocks, |
| 1068 | }; |
| 1069 | |
| 1070 | int __init rd_module_init(void) |
| 1071 | { |
| 1072 | int ret; |
| 1073 | |
| 1074 | ret = transport_subsystem_register(&rd_dr_template); |
| 1075 | if (ret < 0) |
| 1076 | return ret; |
| 1077 | |
| 1078 | ret = transport_subsystem_register(&rd_mcp_template); |
| 1079 | if (ret < 0) { |
| 1080 | transport_subsystem_release(&rd_dr_template); |
| 1081 | return ret; |
| 1082 | } |
| 1083 | |
| 1084 | return 0; |
| 1085 | } |
| 1086 | |
| 1087 | void rd_module_exit(void) |
| 1088 | { |
| 1089 | transport_subsystem_release(&rd_dr_template); |
| 1090 | transport_subsystem_release(&rd_mcp_template); |
| 1091 | } |